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Finding the Fourth Proportional to 203.40, 280.74 and 129.80

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Solution

The fourth proportional to 203.40, 280.74 and 129.80 is: 179.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.40 : 280.74 = 129.80 : x
  2. Step 2: Convert to fraction form
    203.40/280.74 = 129.80/x
  3. Step 3: Cross multiply
    203.40x = 280.74 × 129.80
  4. Step 4: Simplify right side
    203.40x = 36,440.05
  5. Step 5: Solve for x
    x = 36,440.05/203.40
  6. Step 6: Final answer
    x = 179.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.